Grinding device for rotary cutters



H. M. LOOMER.

GRINDING DEVICE FOR ROTARY CUTTERS.

APPLICATIONVFILED APR. 17: 1917.

1,353,254. PatentedSpt. 21,1920.

,onrrao STATES PATENT or ce.

HENRY M. woman, or BEVERLY, MASSACHUSETTS, ASSIGNOR, 1 x MEsuE ASSIGN-MENTS, 'I'O UNITED, SHOE MACHINERY CORPORATION. OF PATERSON, NEW JERsEY,

A CORPORATION OF NEW JERSEY.

GRINDING DEVICE FOR ROTARY GU'ITERS.

To whom it may concern. Be it known that I, HENRY M. LOOMER, a citizenof the United States, residing at Beverly, in the-county of Essex and-State movable with relationto a grinding member whereby the cutter maybe accurately located with respect to the grinding member and theposition of the cutter readily controlled to insure proper grinding ofthe teeth. p

More particularly, an important object of the invention is to provide adevice, especially adapted for use in grinding cutters of the type shownin the patent to Loomer No. 1,105,672 wherein the front face of eachtooth is located at a predetermined angle with respect to the axis ofthe cutter, which shall, nevertheless, be equally; capable of use forgrinding cutters of the type wherein the front face of each tooth is ina plane parallel to the axis of the cutter, as shown, for example, inthe patent to Orcutt No. 295,936. The axial length of the cuttersvaries, however, with the character of the work and with this variationin the axial length there is, in cutters of the former type, a variationin the angle between the plane of the cutting face and the plane of theend face of the cutter.

An importan feature of the invention, therefore, conslsts in cuttersupporting means arranged to be readily adjusted to vary the angularrelation'between the axis of the cutter and the plane of its cuttingedge for cutters of different sizes and shapes.

Further features of the invention relate to the arrangement of thecutter supporting device whereby it may be oscillated to bring thecutter up to and beyond the grinding wheel, to resilient means wherebythese oscillatory movements areefi'ected in a pre- Specification orLettersPatentf P t t d 3 1920 I Application filed April 17, 1917, 7Serial No. 162,758. I

determined plane, and to the organization of the parts of the devicerendering it simple in structure and cheap to ture.

The invention will be more readily understood from a consideration ofthe following specification taken in connection with the accompanyingdrawings, in which, p 1 Y Figure 1 is a perspective view of a. grindmgmember and my novel cutter supporting device r v Fig. 2 is a verticaltransverse section through the oscillatable arm of the cutter supportingdevice; and w V F ig. 3 is a plan view showing-the cutter in operativerelation with the grinding member.

A grinding member 10, of any form tosuit the cutter to be ground, is'mounted upon a shaft 12 j ournaled for rotation in a support 14. Powermay be supplied to this shaft in any convenient manner, as,,for example,by means of avbelt pulley 16. The support 14 is provided with a lateralbracket 18 towhich the slotted end of the two-part bracket 20 of mydevice may be adjustably connected by means of a bolt 22. This bracketis broken'at 21 along a line parallel to the sideof the slotted'endandlugs 21 are provided-upon the lower side of the meeting edges. Oneof-these lugs has a rib 23 cooperating with a corresponding groove inmanufacthe other lug. The latter is slotted for the a reception of abolt 25 holding the parts together. The outer end of this bracket 20 ispreferably designed to extend in a direc tion substantially parallel tothe axis of the grinding wheel and is grooved, as indicated at 24,- toreceive an auxiliary support 26 comprising a base and upstanding lugs.

This auxiliary support, 26 adjustably held in position in the groove bymeans ofa bolt 28owhich passes through a' slot 30 extendinglongitudinally of said grooved portion. It will benoted'that this grooveextends substantially at 'right angles to the slot in the end oftheibracket 20 and that,

in consequence, theauxiliary support is until its motion is limitedbyengagement the end of the spring 34L which bears against the arm 32 isarranged to be normal to the pivot 33 in the plane of a'pin 35 in saidarm. By deflecting this end of the spring to one side of the pin .35;the spring will serve a double purpose and not only-urge the-arm 32around its pivot 33 but will also urge-one pair of coacting surfaces ofthe armand the support into engagement to thereby assist in guiding thearm for oscillation in a predetermined plane. In order to-suittheconvenience. of a particular operative the end of the spring may bedeflected to :one side or the other. ofithe pin' 35 to thereby urge thearm to one-side or the other and bring the correspondingco-actingsurfaces of the arm-and the auxiliary support into en agement.

cuttersupporting table 40 is adjustably connected tothearm 32 and theparts are so arranged that the cutter support-ing arm may be oscillatedthrough a plane connect- I ing the axis of oscillation and the axis ofrotation of the grinding wheel. By means of this arrangement the cuttermay be oscillated through an arc intersecting the periphery of" thegrinding member with the result that the cutter may be brought into andremoved from engagement with the grinding member by one continuousfmovement of the cutter supporting arm.

'In' order to allow adjustment between the plane of the supporting tableand the'plane of oscillation of the arm 32, the latter is grooved forthe reception of a portion 42 of the table having a curved surface. Inthe illustrated arrangement; the portion 4-2 constitutes a cylindricalextension of the supporting table although it is .obviously unnecessarythat this exact arrangement be followed. V-shaped supporting surfaces 38are formed within thegroove of the arm 32 and the portion 42 is held inengagement with said'surfaces by means of an eyebolt 44 whlch engagesthe upper, surface of said portion at a polnt ntermediate the V-shapedsurfaces 38. It will,'therefore, be evident that a three point'supportis'formed which permits of ready and accurate adjustment 1 of thesupporting table 40 both longitudinally of the arm 42 and about itsaxis.

Rotary cutters,'such as are to be ground.

may be provided with a tapered bore-.Lln

this case the diameter of this bore at one end Because of the. sim- 1 ofthe cutter is uniform in cutters of various sizes. WVith this in mind,Lhaveprovided-a pin. -16 .u'ponfltheflsupporting table 40 designed tofit the small endof a tapered bore as well as a bore'of uriformdiameter;thus enabling the readylocation of a cutter upon the table where it maybe firmly held by the workman without danger of movement .dur-' ing thegrinding operation. The firmness with which the cutter maybe positionedis assisted by the fact that the pin 46 is located back from theforwardedgeofQthe table 40 and a' notch 48 -provi'ded to allow the grinder toenter between the-teetlrof the cutter. The latter feature is "claimedin: the

co-pending application of A. Lathamyserial No.44[,936,'filed Aug.- 11,1915 and assigned to the samea'ssignee. 1 I

The particular type or grindiligzwlieel which has been illustrated assuitable foriuse in grinding the' particular type of cutter shown in theLoomer'patent is frusto conical in shape-and the larger base is theactive surface used in grinding. The planeo'f this surface isobviouslyperpendicular toithe axis of the grinding member. Inapplyingfrom the auxiliary support so that (seeFig.

the arm32 may be oscillated from an upper position such as. shown inFig; 2 to a lower position below a plane common to the axis ofoscillation an'd the axis of'thegrinding wheel. In other. words, then-rm32 and its table are of such length, and its axis-of oscillation is solocated relatively to, and

spaced from, the grinding wheel that the range of movement of the armcan carry the cutter down and back in a path which cuts through a planeincluding both the axis of oscillation and the axis of the wheel. The

auxiliary support26 may now be adjusted to bring the notch of the table40 and consequently the tooth to be groundv intojthe plane of the activesurface of the grinding wheel. The operator will then firmly grasp thecutter and the table and-move the same downward to grind the .firsttooth. Jlhis will be efi'ectedin a. continuous downward movement whichmay be repeated. if, neces-- sary. This movement causes the, cutter tosweep past the grinding ,v'vheelat such, point thereof that the operatorcanmanipulate and. watch the work while-standing orfsitting away fromthe path of the dust ,particles resulting from the grinding operation.

Each tooth of the cutter will be brought into position and subjected tothe action of the grinding wheel without the necessity for furtheradjustment aside from the movementof the cutter upon the support of thetable 40. The wearing away of the grinding wheel may be compensated notonly by adjustment of this table with respect to the arm 32 but also byloosening the bolt 25 and moving up the outer end of the bracket 20 withthe attached parts. If the bracket was properly adjusted originally,this compensating adjustment will not disturb the relation of the cuttersupporting table 40 and the grinding wheel, the movement thereof beingin the plane of the active face of the wheel.

While I have herein shown and described the preferred embodiment of myinvention, it will be understood that I do not desire to be limited tothe exact arrangement shown but seek to cover in the appended claims allthose modifications and variations which come within the true scope andspirit of my invention.

Having thus described my invention, what I claim as new and desire tosecure by Letters Patent of the United States is 1. In a machine forgrinding rotary out ters, a grinding wheel, a support, an arm pivotallymounted upon said support for movement about an axis substantiallyparallel to the axis of the grinding wheel, a table carried by'said armand having means for rotatively supporting a cutter, and means foradjusting said table on said arm to vary the angle between the plane ofsaid table and the plane of oscillation.

2. In a machine for grinding rotary cutters, a grinding wheel, asupport, an'arm pivotally mounted upon said support for movement aboutan axis substantially parallel to the axis of the grinding wheel, acutter supporting table provided with a portion having a curved surface,a groove in said arm adapted to cooperate with the curved surface onsaid table, and means for clamping said portion in said groove arrangedto allow the angle between the plane of the table and the plane ofoscillation to be varied.

In a machine for grinding rotary cutters, a grinding wheel, a support,an arm pivotally mounted upon said support for movement about an axissubstantially parallel to the axis of the grinding wheel and providedwith a cutter supporting table angularly adjustable with respect to saidarm, said cutter supporting arm being arranged to permit a range ofoscillation traversing a plane intersecting the axis of oscillation andthe'axis of the grinding wheel.

4. In a machine for grinding rotary cutters, a grinding wheel, asupport, an auxiliary support mounted thereon for universal adjustmentin a horizontal plane, an arm pivotally mounted upon said auxiliarysupport, spaced V-shaped supporting surfaces on said arm, a cuttersupporting table provided with a portion having a curved surface andadapted to be adjustably mounted on said supporting surfaces, and meansfor clamping said curved portion to said arm intermediate saidsupporting surfaces whereby a three point support is formed whichpermits of adjustment of the angle between the plane of the cuttersupporting table and the plane of oscillation of the arm.

5. In a machine for grinding rotary cutters, a grinding wheel, asupport, a bracket adjustably attached to said support, an auxiliarysupport adjustably attached to said bracket, an arm pivotally attachedto said auxiliary support, resilient means for rotating said arm in onedirection, a stop opposing the action of said resilient means, a notchedcutter supporting table provided with a centering pin perpendicularthereto, and means for attaching said table to said arm arranged toallow adjustment of the angle between the plane of the table and theplane of oscillation.

6. In a machinefor grinding rotary cutters, a grinding wheel, a support,an arm pivotally mounted upon said support for movement toward and awayfrom said grinding wheel, said arm and support having coacting surfacesfor guiding the movements of the arm, and resilient means urging saidarm in one direction around its pivot and arranged to urge said co-acting surfaces into engagement. 7 v I 7. In a machine for grindingrotary cutters, a grinding wheel, a support, an arm pivotally mountedupon said support for movement toward and away from said grinding wheel,said arm and support having pairs of surfaces arranged to co -act whenbrought into engagement to guide the movements of the arm, and resilientmeans urging said arm in one direction around its pivot name to thisspecification.

HENRY M. LOOMER.

